|
| year | production | consumption |
| 1980 | 1,435.00 | 1,873.00 |
| 1981 | 1,285.00 | 1,768.00 |
| 1982 | 1,271.00 | 1,578.00 |
| 1983 | 1,356.00 | 1,448.00 |
| 1984 | 1,438.00 | 1,507.00 |
| 1985 | 1,471.00 | 1,514.00 |
| 1986 | 1,474.00 | 1,518.00 |
| 1987 | 1,535.00 | 1,592.00 |
| 1988 | 1,616.00 | 1,666.00 |
| 1989 | 1,560.00 | 1,739.00 |
| 1990 | 1,553.00 | 1,722.00 |
| 1991 | 1,547.98 | 1,662.00 |
| 1992 | 1,605.22 | 1,709.00 |
| 1993 | 1,679.45 | 1,734.00 |
| 1994 | 1,746.12 | 1,755.00 |
| 1995 | 1,805.25 | 1,799.00 |
| 1996 | 1,836.70 | 1,853.00 |
| 1997 | 1,922.24 | 1,940.00 |
| 1998 | 1,981.09 | 1,931.00 |
| 1999 | 1,906.60 | 2,016.00 |
| 2000 | 1,976.89 | 2,013.91 |
| 2001 | 2,029.17 | 2,043.17 |
| 2002 | 2,170.60 | 2,065.07 |
| 2003 | 2,305.73 | 2,190.71 |
| 2004 | 2,398.42 | 2,281.97 |
| 2005 | 2,368.88 | 2,314.98 |
| 2006 | 2,525.40 | 2,228.85 |
| 2007 | 2,628.13 | 2,283.32 |
| 2008 | 2,579.31 | 2,231.57 |
| 2009 | 2,579.48 | 2,152.72 |
| 2010 | 2,740.76 | 2,257.51 |
| 2011 | 2,900.65 | 2,289.31 |
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